括号[form-parentheses]

一个含有括注表达式的句子，其标点打在最后一个括号标记之外，完全就像该括注表达式不存在一样。括号内的表达式按它自己独立来标点，只是省略句末的句号，除非那是问号或感叹号。

I went to her house yesterday (my third attempt to see her), but she had left town.

He declares (and why should we doubt his good faith?) that he is now certain of success.

（当一个完全独立的表达式或句子被加上括号时，句末的句号位于最后一个括号标记之前。）